#1: The Amazing Spider-Man

Leading the pack of Marvel superheroes is Spider-Man. With the original Amazing Spider-Man comic series being the world's most popular single title, comic book collecting would not be the same without Spidey.

This phenomenon has led to the introduction of numerous spin-off series. None are as appealing as the original, but the relative affordability of Spectacular Spider-Man has seen prices increase in recent years.

#7: The Fantastic Four

Once the most popular comic book series, the original Marvel Comics
characters team-up of the Human Torch, Mr. Fantastic, the Invisible Girl
and the Thing have slipped down in popularity in the last decade or so.

#8: The Silver Surfer

First appearing in Fantastic Four #48, #49 and #50 (#50 being the
first full Silver Surfer cover -- see image above), this otherwordly surfer is a very
popular character that has been long tipped for big movie roles.

The bad news is that this incredible character is really one of the most under-used Marvel Comics characters.

He had one series, and a handful of crossover appearances, only.

The good news is, if you have Silver Surfer comics in your collection, that the values of classic issues have spiked up in recent years.